EP3672059A1 - Anpassung der abbremsung eines motors als eine funktion einer durchschnittlichen gleichgerichteten spannung - Google Patents

Anpassung der abbremsung eines motors als eine funktion einer durchschnittlichen gleichgerichteten spannung Download PDF

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Publication number
EP3672059A1
EP3672059A1 EP19212495.6A EP19212495A EP3672059A1 EP 3672059 A1 EP3672059 A1 EP 3672059A1 EP 19212495 A EP19212495 A EP 19212495A EP 3672059 A1 EP3672059 A1 EP 3672059A1
Authority
EP
European Patent Office
Prior art keywords
voltage
motor
average
deceleration
function
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19212495.6A
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English (en)
French (fr)
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EP3672059B1 (de
Inventor
François Malrait
Alain Dutrey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schneider Toshiba Inverter Europe SAS
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Schneider Toshiba Inverter Europe SAS
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Publication of EP3672059A1 publication Critical patent/EP3672059A1/de
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H02P23/20—Controlling the acceleration or deceleration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H02P23/28—Controlling the motor by varying the switching frequency of switches connected to a DC supply and the motor phases
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
    • H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
    • H02P3/18—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor

Definitions

  • the invention relates to the control of the electrical supply of a device such as a motor, and in particular the control of the control voltage of a variable speed drive of a motor.
  • a high voltage is supplied by putting in series a certain number of low voltage converters (which are then called " power cells " or "power cell” in English). dimmer.
  • the control of these power cells makes it possible to supply a voltage at several levels, or multi-levels, each power cell adding a voltage making it possible to reach successive voltage levels.
  • Low voltage is understood, according to European standards, to be voltages between 0 and 1000 volts in alternating voltage conditions and between 0 and 1500 volts in direct voltage conditions.
  • High voltage is understood to mean voltages greater than 1000 volts in alternating voltage conditions and greater than 1500 volts in continuous voltage conditions.
  • a low voltage drive can have a similar structure but with a single power cell.
  • a deceleration consists of a transfer of energy from a mechanical system (motor rotor shaft and driving load) to an electrical system (capacities of the variable speed drive).
  • the sum of the time derivatives of the electrical and mechanical energies of the system (therefore of the corresponding powers) is therefore equal to the opposite of the power lost by the system.
  • the motor can go into generator mode and send electrical energy back to the drive.
  • the voltage on each power cell thus increases, and needs to be controlled in order to avoid damaging or even destroying the capacities of the power cells.
  • the present invention overcomes the drawbacks mentioned above.
  • the invention allows access to the rectified voltage (an average value) without requiring sensors on each power cell.
  • the determination of the mean rectified voltage value is a function of the mean motor voltage, of a reference motor voltage and of a reference rectified voltage, the reference motor voltage being obtained from a command received at the input of the frequency converter and the rectified reference voltage being a default value.
  • Such an embodiment allows quick access to the average rectified voltage value.
  • the method can comprise the determination of at least one reference motor voltage, the reference motor voltage can be controlled by the average motor voltage measured by generation of a correction motor voltage, a control motor voltage being obtained from the reference motor voltage and the correction voltage, the average rectified voltage can be obtained from the average motor voltage, the control motor voltage and a reference rectified voltage, the reference rectified voltage being a default value.
  • This embodiment provides access to the average rectified voltage value while controlling the reference motor voltage.
  • the adaptation of the deceleration comprises the comparison of the average rectified voltage with at least a predefined threshold, and the modification of a torque applied to the motor as a function of a result of the comparison.
  • the threshold can be predefined as a function of a maximum voltage of the capacities of the power cells of the frequency converter.
  • this embodiment ensures the protection of the power cells.
  • the adaptation of the deceleration can comprise the replacement, for a following period, of a reference rectified voltage by the average rectified voltage in order to determine control orders of the power cells of the variable speed drive, the rectified reference voltage being a default value.
  • control of the power cells is optimized when the motor voltages are produced.
  • the given period can be equal to a sampling period of a reference motor voltage at the input of the variable speed drive.
  • variable speed drive can comprise 3 ⁇ N power cells, with three phases each comprising N power cells connected in series, respective outputs of each phase can be connected in star or in triangle to the electric motor.
  • power cell control orders can be determined from a reference motor voltage and from an additional strategy voltage common to the three phases, the additional strategy voltage being determined so as to minimize a number of switchings of power cell switches.
  • the number of switches of the power cells can be minimized without changing the voltages applied to the motor.
  • a second aspect of the invention relates to a computer program executable by a processor and comprising instructions for, when executed by the processor, implementing the steps of a method according to the first aspect of the invention.
  • the figure 1 presents a power supply system for an electric motor 100, such as an induction motor for example, supplied by a three-phase variable power supply.
  • the variable speed drive 102 comprises a transformer 111 receiving a three-phase variable power supply from the sector 110.
  • the secondary of the transformer 111 is connected to a power stage of the variable speed drive 102.
  • the transformer 111 can be a multi-winding transformer so as to deliver voltages to several power cells described below.
  • the power stage of the variable speed drive 102 can include one or more low-voltage power cells 101.
  • the variable speed drive 102 comprises 3 ⁇ N power cells, with N cells of power dedicated to each phase, N being greater than or equal to 1.
  • the speed variator 102 is a low voltage variator.
  • Each power cell 101 receives as input three-phase power from the secondary of the transformer 111 and may include a rectifier (not shown in the figure 1 ) at the input, the rectifier being able to rectify the three-phase variable supply received so as to provide a DC voltage.
  • the rectified voltage obtained for each power cell 101 is also called direct current bus voltage, DC, or bus voltage.
  • the rectifier can include a diode bridge, a thyristor bridge or any other system known to rectify three-phase variable voltages.
  • the rectifier at the input is thus an AC / DC converter.
  • Each power cell then comprises a capacitance capable of implementing an intermediate capacitive filtering.
  • each power cell 101 can comprise an inverter for the generation of a pulse width modulation signal PWM (for “ Pulse Width Modulation ” in English).
  • PWM pulse width modulation signal
  • Such an inverter can include an H-bridge comprising four switches controlled two by two.
  • a power electronics system using such a principle of chopped voltage applies to the motor 120, per phase, a voltage which is proportional to one or more rectified voltages. On average, the proportion applied corresponds to the ratio between the control voltage and the reference rectified voltage (defined below).
  • the operation of an H-bridge is well known and will not be described further in the present application.
  • the switches of a power cell 101 are controlled by a control cell 103 of the power cell 101.
  • the system further comprises a control device 120 able to control the electrical supply of the motor 100.
  • the control device 120 can control the control cells 103 of the power cells 101.
  • the control device 120 can in addition to controlling switches 105 making it possible to put a subset of the N power cells in series for each phase. As a variant, these switches are controlled by the control device 120 via the control cells 103.
  • the control cells 103 can receive control orders from the control device 120 from which the control cells 103 can apply a proportion, or duty cycle, to the rectified voltage, by controlling the switches of the H-bridge.
  • the switches of the H-bridge can be transistors of the IGBT insulated gate bipolar transistors type (for “ Insulated Gate Bipolar Transistor ”). The advantage of IGBT type transistors is that they have a high switching speed.
  • the three-phase voltages supplying the motor 100 are thus obtained by summing the PWM output voltages of the power cells 101 for which the switches 105 are closed.
  • control device Other functions of the control device will be detailed with reference to figures 2 to 4 .
  • the figure 2 presents a control device 120 according to certain embodiments of the invention.
  • the control device 120 for this purpose comprises a plurality of units dedicated to complementary functions according to the invention.
  • Each unit can be implemented in software, involving at least a processor and a memory, or by a monolithic set of electronic components programmed for a given function, such as a microprocessor or ASIC for example.
  • a single processor or a single monolithic assembly is configured to implement all of the complementary functions of the control device 120 according to the invention.
  • the control device 120 receives as input a speed command (in particular a deceleration command in the context of the invention) which is processed by a reference motor voltage calculation unit 201, configured to calculate reference motor voltages from the speed control.
  • the reference motor voltages can be represented by a vector V123REF of three voltages denoted V1REF, V2REF and V3REF (one for each phase).
  • a unit for calculating control motor voltages 202 is configured to calculate motor voltages for control.
  • the control motor voltages can be represented by a vector V123CONTROL of three voltages denoted V1CONTROL, V2CONTROL and V3CONTROL.
  • the unit 202 is capable of receiving average motor voltages from the unit 205 described below.
  • the average motor voltages can be represented by a vector V123MEAS of three voltages denoted V1MEAS, V2MEAS and V3MEAS.
  • the unit 202 can determine correction motor voltages represented by a vector V123CORRECTION of three correction values V1CORRECTION, V2CORRECTION and V3CORRECTION.
  • the control device 120 further comprises a unit 203 for calculating control commands of the hash topology.
  • the unit 203 firstly determines control voltages, represented by the vector V123COMMAND of three voltages V1COMMAND, V2COMMAND and V3COMMAND on the basis of the control voltages V123CONTROL.
  • the unit 203 can also take into account a strategy motor voltage VSTRATEGY which is a voltage value corresponding to an electrical neutral point of the motor, allowing the implementation of different PWM strategies of switching.
  • VSTRATEGY is a voltage value corresponding to an electrical neutral point of the motor
  • each phase of the variable speed drive 102 provides a potential Vi, i being the index of the phase, and the voltages applied to the motor are composed as a function of the potentials Vi.
  • the value Ui is invariant to a value VSTRATEGY which would be added to the three output values V1, V2 and V3.
  • VSTRATEGY gives a degree of freedom to apply a strategy dedicated to different objectives, such as maximizing a amplitude of coil voltage (compound voltage at the output of the drive), minimize switching, etc.
  • the unit 203 then calculates the control orders from the rectified voltage of each power cell 101, which is the voltage which is then chopped by the H-bridge of the power cell 101.
  • a such rectified voltage is not directly measured in the context of the invention, and a reference rectified voltage VBUSDRIVE originating from a unit for determining the reference voltage 204 is initially used in order to calculate the control orders.
  • the unit 203 determines the modulation ratios represented in the form of a vector m123 comprising the values m1, m2 and m3. Such modulation ratios are compared to triangular carriers to determine the following switching orders. Each modulation ratio m1, m2 and m3 can change N times in values over a carrier period.
  • the unit 203 further determines switching orders of the switches of the H-bridges of the power cells 101, the switching orders being represented by a vector T123, comprising orders T1, T2 and T3 respectively. for each of the three phases.
  • the orders Ti are switching vectors, each component of the vector corresponding to a power cell of the branch i.
  • Each of the N components of the switching vector Ti can be obtained by comparing the switching vector mi with the triangular carrier corresponding to phase i.
  • the control orders may also include activation / deactivation orders of the switches 105 of the power cells.
  • the unit 203 is further configured to transmit the control commands used to control the switches 105, to activate or deactivate some of the power cells previously deactivated / activated, and / or to control the control cells 103 of the power 101 active, in order to realize the PWM output voltages of the power cells.
  • V123REALIZED comprising the voltages V1REALIZED, V2REALIZED and V3REALIZED corresponding to the three respective phases.
  • the control device 120 further comprises a unit for calculating the average motor voltages 205.
  • the unit 205 is suitable for receiving continuous, or discrete measurements at a given frequency, of the voltages applied to the motor. From the measurements of motor voltages received over a given period, the unit 205 determines average motor voltages over the given period represented by a vector V123MEAS comprising the voltages V1MEAS, V2MEAS and V3MEAS for the three respective phases.
  • a period can be fixed or variable.
  • the period used to average the motor voltages can be calculated from a sampling period of the reference motor voltages V123REF, which is technologically more easily achievable than a measurement of the motor voltages sampled as a function of the characteristic times. of the power stage (the calculation of the reference motor voltages and the production of the voltages by the power stage being synchronized).
  • the figure 4 illustrates the synchronization between the calculation of average motor voltages and the achievement of voltages by the power stage.
  • the figure 4 presents a case with five power cells for one phase of the variable speed drive.
  • the curves 401.1 to 401.5 represent the basic triangular signals used by the unit 203 to generate the switching orders T123 by comparison between the modulation ratios mi (m1, m2 or m3) and the triangular signals. Each triangular signal corresponds to one of the power cells of the phase. Such a comparison in order to determine the switching orders T123 of an H-bridge of a power cell is well known and will not be described further. Triangular signals are voltage values that change over time (on the abscissa).
  • the control device 120 further comprises a unit for calculating the average rectified voltage 206, capable of calculating an average rectified voltage value VBUS from the average motor voltages. Two embodiments of the calculation of the average rectified voltage are given below, by way of illustration.
  • the reference motor voltages V123REF are applied without corrections linked to the average measured voltages V123MEAS.
  • the V123CORRECTION correction voltages are therefore not taken into account.
  • the average rectified voltage VBUS is further calculated from the reference motor voltages and the reference rectified voltage, which appears from the calculations detailed below.
  • V 123 CORRECTION V 123 REF - V 123 MEAS ;
  • V 123 COMMAND V 123 REF + V 123 COMPENSATION + VSTRATEGY ;
  • m 123 V 123 REF / VBUSDRIVE + V 123 COMPENSATION + VSTRATEGY / VBUSDRIVE ;
  • V 123 REALIZED V 123 REF * gV + V 123 COMPENSATION + VSTRATEGY * gV - V 123 DROP ;
  • V 123 MEAS V 123 REF * gV + V 123 COMPENSATION + VSTRATEGY * gV - V 123 DROP - WNV ; (gV being the VBUS / VBUSDRIVE ratio to be determined at the end of the process according to the invention).
  • V 123 MEAS V 123 REF * gV + oV ;
  • V123CONTROL V123REF (operation of the unit 202 according to the first embodiment);
  • V 123 CORRECTION 1 - gV * V 123 REF - oV .
  • oV can be considered as an offset, or "offset", representative of the imperfections of the power stage. If the imperfections are compensated, oV approaches 0.
  • gV V123MEAS / V123REF, and the VBUS value can thus be determined.
  • the ratio presented above and allowing access to gV corresponds to the ratio of the amplitude of the vector V123MEAS to the amplitude of the vector V123REF.
  • Clarke-type transformations making it possible to transform a three-phase vector into a two-phase vector (often noted (alpha, beta)).
  • V 1 Vcos wt - phi + VN ;
  • V 2 Vcos wt - phi - 2 pi / 3 + VN ;
  • V 3 Vcos wt - phi - 4 pi / 3 + VN .
  • Valpha Vcos wt - phi ;
  • Vbeta Vsin wt - phi .
  • the unit 202 regulates the measured motor voltages V123MEAS at the reference motor voltages V123REF, by calculating the correction motor voltages V123CORRECTION, the unit 203 applying the correction motor voltages V123CORRECTION when determining the voltages V123CONTROL control unit.
  • the average rectified voltage VBUS is calculated as for the first mode (therefore on the basis of the measured motor voltages V123MEAS and the reference motor voltages V123REF), or by replacing the average motor voltages V123MEAS or the motor voltages reference V123REF by the V123CORRECTION correction motor voltages or by the V123COMMAND control voltages, as detailed in the calculations below.
  • V 123 REF V 123 MEAS ;
  • V 123 CONTROL V 123 REF + V 123 CORRECTION ;
  • V 123 COMMAND V 123 CONTROL + V 123 COMPENSATION + VSTRATEGY ;
  • V 123 COMMAND / VBUSDRIVE m 123 ;
  • m 123 * VBUS - V 123 DROP V 123 REALIZED ;
  • V 123 MEAS V 123 REALIZED - WNV .
  • V 123 CORRECTION V 123 REF * 1 - gV - oV / gV ;
  • V 123 MEAS V 123 REF ;
  • V 123 CONTROL V 123 REF / gV - oV / gV .
  • the average rectified voltage VBUS can be used by the unit 204 to replace the reference rectified voltage VBUSDRIVE for the following period.
  • the voltage VBUS can replace the rectified reference voltage VBUSDRIVE in a memory of the unit 204.
  • the motor torque can be controlled in order to control the deceleration.
  • the reference motor voltages V123REF can be controlled by a unit 207.
  • the deceleration of the motor can be increased.
  • the second threshold th2 being an acceptable limit voltage for the capacities of the power cells 101, the deceleration can be gradually reduced so as not to re-inject the energy that can no longer be stored or dissipated.
  • the average rectified voltage is greater than th2, then the variable speed drive 102 stops controlling the motor in order to protect the variable speed drive 102.
  • the values th1 and th2 can be predetermined.
  • the comparison of the mean rectified voltage value VBUS can be compared with the thresholds th1 and th2 in order to control the supply frequency of the electrical device.
  • the figure 3 illustrates the structure of the units of the control device according to an embodiment of the invention.
  • each of the units presented above with reference to the figure 2 can understand the structure illustrated on the figure 3 .
  • each of these units, or some of them may be in the form of an electronic circuit dedicated to the performance of its proper function.
  • a dedicated electronic circuit can be a microcontroller or a monolithic ASIC configured for the proper function.
  • the unit includes a processor 300 capable of communicating bidirectionally, via buses, with a memory 301 such as a random access memory RAM, a ROM read-only memory, a flash memory, a hard disk and / or any type of medium. storage.
  • the processor 300 is able to execute instructions for carrying out the function which is specific to it.
  • the unit further comprises an input interface 302 and an output interface 303 in order to communicate with the other entities of the control device, to receive voltage measurements, to transmit / receive commands.
  • the unit may further comprise a database for storing the data used for the performance of the function which is specific to the unit.
  • the processor 300 can perform the functions of all of the units 201 to 207 described above with reference to the figure 2 .
  • the figure 5 is a diagram illustrating the steps of a method according to several embodiments of the invention.
  • Steps 501 to 509 are implemented during a current period consecutive to a previous period.
  • the unit 201 receives an average motor voltage resulting from measurements carried out over the previous period, as detailed with reference to the figure 2 .
  • step 502 the unit 201 can calculate reference motor voltages V123REF, as detailed with reference to the figure 2 .
  • the unit 202 determines control voltages V123CONTROL, according to the first embodiment (by copying the reference motor voltages V123REF) or according to the second embodiment of the invention (taking into account the voltages V123CORRECTION).
  • the unit 203 can use the voltages VSTRATEGY and V123COMPENSATION to determine control voltages V123COMMAND from the control voltages V123CONTROL, such a step being optional, the control voltages V123COMMAND being able to be deduced directly from the control voltages V123CONTROL.
  • the unit 203 determines the control orders for the power stage T123, as detailed above.
  • control orders T123 are then transmitted to the three branches of the power stage for producing the motor voltages V123REALIZED in a step 506.
  • the average motor voltages V123MEAS are determined by the unit 205, as detailed above.
  • the determined average motor voltages V123MEAS can be used during step 501 of a following period consecutive to the current phase.
  • the average rectified voltage VBUS can be determined by the unit 206 as detailed above.
  • the average rectified voltage VBUS can replace the reference rectified voltage VBUSDRIVE in unit 204.
  • the control of the motor is adapted as a function of the average rectified voltage VBUS.
  • a check may include replacing the reference rectified voltage VBUSDRIVE by the average rectified voltage VBUS and / or modifying the frequency of the motor or reference motor voltages V123REF by the unit 207 (return to step 502 for the following period), either by modifying the engine torque.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)
  • Inverter Devices (AREA)
EP19212495.6A 2018-12-21 2019-11-29 Anpassung der abbremsung eines motors als eine funktion einer durchschnittlichen gleichgerichteten spannung Active EP3672059B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1873755A FR3091072B1 (fr) 2018-12-21 2018-12-21 Adaptation de la décélération d’un moteur en fonction d’une tension redressée moyenne

Publications (2)

Publication Number Publication Date
EP3672059A1 true EP3672059A1 (de) 2020-06-24
EP3672059B1 EP3672059B1 (de) 2022-02-16

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EP19212495.6A Active EP3672059B1 (de) 2018-12-21 2019-11-29 Anpassung der abbremsung eines motors als eine funktion einer durchschnittlichen gleichgerichteten spannung

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Country Link
US (1) US11784603B2 (de)
EP (1) EP3672059B1 (de)
CN (1) CN111355413A (de)
ES (1) ES2907753T3 (de)
FR (1) FR3091072B1 (de)

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Publication number Priority date Publication date Assignee Title
JP2023006250A (ja) * 2021-06-30 2023-01-18 富士電機株式会社 集積回路、及びパワーモジュール

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008043013A (ja) * 2006-08-03 2008-02-21 Matsushita Electric Ind Co Ltd モータの駆動装置
EP1914428A2 (de) * 2006-10-13 2008-04-23 A.O. Smith Corporation Steuerung für einen Motor und Verfahren zur Motorsteuerung
US10008937B1 (en) * 2016-12-26 2018-06-26 Lsis Co., Ltd. Apparatus for controlling DC link voltage in power cell of medium-voltage inverter

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6542390B2 (en) * 2001-01-02 2003-04-01 General Electric Company System and method for regenerative PWM AC power conversion
JP5932136B2 (ja) * 2013-03-12 2016-06-08 三菱電機株式会社 モータ制御装置
US10218277B2 (en) * 2016-02-22 2019-02-26 The Boeing Company Adaptable high efficiency power inverter system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008043013A (ja) * 2006-08-03 2008-02-21 Matsushita Electric Ind Co Ltd モータの駆動装置
EP1914428A2 (de) * 2006-10-13 2008-04-23 A.O. Smith Corporation Steuerung für einen Motor und Verfahren zur Motorsteuerung
US10008937B1 (en) * 2016-12-26 2018-06-26 Lsis Co., Ltd. Apparatus for controlling DC link voltage in power cell of medium-voltage inverter

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Publication number Publication date
FR3091072B1 (fr) 2020-11-27
ES2907753T3 (es) 2022-04-26
EP3672059B1 (de) 2022-02-16
RU2019142476A3 (de) 2021-12-17
US11784603B2 (en) 2023-10-10
FR3091072A1 (fr) 2020-06-26
US20200204102A1 (en) 2020-06-25
RU2019142476A (ru) 2021-06-21
CN111355413A (zh) 2020-06-30

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